/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */
package com.afwsamples.testdpc.util;

import android.os.Handler;
import android.os.Looper;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;

/** Extension of {@link AbstractExecutorService} which executed on a provided looper. */
public class LooperExecutor extends AbstractExecutorService {

  private final Handler mHandler;

  public LooperExecutor(Looper looper) {
    mHandler = new Handler(looper);
  }

  @Override
  public void execute(Runnable runnable) {
    if (mHandler.getLooper() == Looper.myLooper()) {
      runnable.run();
    } else {
      mHandler.post(runnable);
    }
  }

  /** Not supported and throws an exception when used. */
  @Override
  public void shutdown() {
    throw new UnsupportedOperationException();
  }

  /** Not supported and throws an exception when used. */
  @Override
  @Deprecated
  public List<Runnable> shutdownNow() {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean isShutdown() {
    return false;
  }

  @Override
  public boolean isTerminated() {
    return false;
  }

  /** Not supported and throws an exception when used. */
  @Override
  public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
    throw new UnsupportedOperationException();
  }
}
